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Abstract
Many security primitives are based on hard mathematical problems. The most common computer authentication method is to use alphanumerical usernames and passwords. This method has been shown to have significant drawbacks. For example, user tends to pick a passwords that can be easily guessed. On the other hand, if a password is hard to guess, then it is often hard to remember. It is a novel family of graphical password systems built on top of captcha technology. It is a graphical password scheme as well as it addresses a number of security problems such as online guessing attacks, relay attacks, shoulder surfing attacks. A CaRP also offers a novel approach to address the image hotspot problem in popular graphical password systems such as passpoints, that lead to week password choices. CaRP is not a proper solution but it offers security and usability for some practical applications for improving online security.